<!DOCTYPE html>
<html>

<head>
  <title> 爱心代码 </title>
  <meta charset="utf-8">
  <meta name="Keywords" content="爱心代码，程序员表白">
  <link rel="shortcut icon" href="./picture/爱心.png" type="image/x-icon">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <!--   https://github.com/heshuyue/love-code   -->
  <style>
    html,
    body {
      height: 100%;
      padding: 0;
      margin: 0;
    }

    body {
      background-image: url(./picture/background.jpg);
    }

    canvas {
      position: absolute;
      width: 100%;
      height: 100%;
    }

    .title {
      width: 20%;
      height: 30%;
      /* 文字居中 */
      text-align: center;
      /* 字体大小 */
      font-size: 30px;
      /* 背景颜色 */
      background-color: transparent;
      /* 文字颜色 */
      color: rgba(250, 56, 175, 0.829);
      /* 左右居中 */
      margin: auto;
      /* 定位 */
      position: relative;
      /* 上边距 */
      top: 40%;
      /* 字体 */
      font-family: "幼圆";
    }
  </style>

</head>

<body>


  <canvas id="pinkboard"></canvas>

  <div class="title">魏亚亚❤薛旭升</div>
  <script>

    var settings = {
      particles: {
        length: 500,
        duration: 2,
        velocity: 100,
        effect: -0.75,
        size: 30,
      },
    };


    (function () { var b = 0; var c = ["ms", "moz", "webkit", "o"]; for (var a = 0; a < c.length && !window.requestAnimationFrame; ++a) { window.requestAnimationFrame = window[c[a] + "RequestAnimationFrame"]; window.cancelAnimationFrame = window[c[a] + "CancelAnimationFrame"] || window[c[a] + "CancelRequestAnimationFrame"] } if (!window.requestAnimationFrame) { window.requestAnimationFrame = function (h, e) { var d = new Date().getTime(); var f = Math.max(0, 16 - (d - b)); var g = window.setTimeout(function () { h(d + f) }, f); b = d + f; return g } } if (!window.cancelAnimationFrame) { window.cancelAnimationFrame = function (d) { clearTimeout(d) } } }());


    var Point = (function () {
      function Point(x, y) {
        this.x = (typeof x !== 'undefined') ? x : 0;
        this.y = (typeof y !== 'undefined') ? y : 0;
      }
      Point.prototype.clone = function () {
        return new Point(this.x, this.y);
      };
      Point.prototype.length = function (length) {
        if (typeof length == 'undefined')
          return Math.sqrt(this.x * this.x + this.y * this.y);
        this.normalize();
        this.x *= length;
        this.y *= length;
        return this;
      };
      Point.prototype.normalize = function () {
        var length = this.length();
        this.x /= length;
        this.y /= length;
        return this;
      };
      return Point;
    })();


    var Particle = (function () {
      function Particle() {
        this.position = new Point();
        this.velocity = new Point();
        this.acceleration = new Point();
        this.age = 0;
      }
      Particle.prototype.initialize = function (x, y, dx, dy) {
        this.position.x = x;
        this.position.y = y;
        this.velocity.x = dx;
        this.velocity.y = dy;
        this.acceleration.x = dx * settings.particles.effect;
        this.acceleration.y = dy * settings.particles.effect;
        this.age = 0;
      };
      Particle.prototype.update = function (deltaTime) {
        this.position.x += this.velocity.x * deltaTime;
        this.position.y += this.velocity.y * deltaTime;
        this.velocity.x += this.acceleration.x * deltaTime;
        this.velocity.y += this.acceleration.y * deltaTime;
        this.age += deltaTime;
      };
      Particle.prototype.draw = function (context, image) {
        function ease(t) {
          return (--t) * t * t + 1;
        }
        var size = image.width * ease(this.age / settings.particles.duration);
        context.globalAlpha = 1 - this.age / settings.particles.duration;
        context.drawImage(image, this.position.x - size / 2, this.position.y - size / 2, size, size);
      };
      return Particle;
    })();


    var ParticlePool = (function () {
      var particles,
        firstActive = 0,
        firstFree = 0,
        duration = settings.particles.duration;

      function ParticlePool(length) {
        // create and populate particle pool
        particles = new Array(length);
        for (var i = 0; i < particles.length; i++)
          particles[i] = new Particle();
      }
      ParticlePool.prototype.add = function (x, y, dx, dy) {
        particles[firstFree].initialize(x, y, dx, dy);

        // handle circular queue
        firstFree++;
        if (firstFree == particles.length) firstFree = 0;
        if (firstActive == firstFree) firstActive++;
        if (firstActive == particles.length) firstActive = 0;
      };
      ParticlePool.prototype.update = function (deltaTime) {
        var i;


        if (firstActive < firstFree) {
          for (i = firstActive; i < firstFree; i++)
            particles[i].update(deltaTime);
        }
        if (firstFree < firstActive) {
          for (i = firstActive; i < particles.length; i++)
            particles[i].update(deltaTime);
          for (i = 0; i < firstFree; i++)
            particles[i].update(deltaTime);
        }


        while (particles[firstActive].age >= duration && firstActive != firstFree) {
          firstActive++;
          if (firstActive == particles.length) firstActive = 0;
        }


      };
      ParticlePool.prototype.draw = function (context, image) {

        if (firstActive < firstFree) {
          for (i = firstActive; i < firstFree; i++)
            particles[i].draw(context, image);
        }
        if (firstFree < firstActive) {
          for (i = firstActive; i < particles.length; i++)
            particles[i].draw(context, image);
          for (i = 0; i < firstFree; i++)
            particles[i].draw(context, image);
        }
      };
      return ParticlePool;
    })();


    (function (canvas) {
      var context = canvas.getContext('2d'),
        particles = new ParticlePool(settings.particles.length),
        particleRate = settings.particles.length / settings.particles.duration,
        time;


      function pointOnHeart(t) {
        return new Point(
          160 * Math.pow(Math.sin(t), 3),
          130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25
        );
      }


      var image = (function () {
        var canvas = document.createElement('canvas'),
          context = canvas.getContext('2d');
        canvas.width = settings.particles.size;
        canvas.height = settings.particles.size;

        function to(t) {
          var point = pointOnHeart(t);
          point.x = settings.particles.size / 2 + point.x * settings.particles.size / 350;
          point.y = settings.particles.size / 2 - point.y * settings.particles.size / 350;
          return point;
        }

        context.beginPath();
        var t = -Math.PI;
        var point = to(t);
        context.moveTo(point.x, point.y);
        while (t < Math.PI) {
          t += 0.01;
          point = to(t);
          context.lineTo(point.x, point.y);
        }
        context.closePath();

        context.fillStyle = '#ea80b0';
        context.fill();

        var image = new Image();
        image.src = canvas.toDataURL();
        return image;
      })();


      function render() {

        requestAnimationFrame(render);


        var newTime = new Date().getTime() / 1000,
          deltaTime = newTime - (time || newTime);
        time = newTime;


        context.clearRect(0, 0, canvas.width, canvas.height);


        var amount = particleRate * deltaTime;
        for (var i = 0; i < amount; i++) {
          var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());
          var dir = pos.clone().length(settings.particles.velocity);
          particles.add(canvas.width / 2 + pos.x, canvas.height / 2 - pos.y, dir.x, -dir.y);
        }


        particles.update(deltaTime);
        particles.draw(context, image);
      }


      function onResize() {
        canvas.width = canvas.clientWidth;
        canvas.height = canvas.clientHeight;
      }
      window.onresize = onResize;


      setTimeout(function () {
        onResize();
        render();
      }, 10);
    })(document.getElementById('pinkboard'));
  </script>



</body>

</html>